linux-kernel - [PATCH v2 2/5] xhci: Don't issue Reset Device command to Etron xHCI host

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Message-Id: <20241028025337.6372-3-ki.chiang65@gmail.com>
Date: Mon, 28 Oct 2024 10:53:34 +0800
From: Kuangyi Chiang <ki.chiang65@...il.com>
To: mathias.nyman@...el.com,
	gregkh@...uxfoundation.org
Cc: linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	ki.chiang65@...il.com,
	stable@...r.kernel.org
Subject: [PATCH v2 2/5] xhci: Don't issue Reset Device command to Etron xHCI host

Sometimes the hub driver does not recognize the USB device connected
to the external USB2.0 hub when the system resumes from S4.

After the SetPortFeature(PORT_RESET) request is completed, the hub
driver calls the HCD reset_device callback, which will issue a Reset
Device command and free all structures associated with endpoints
that were disabled.

This happens when the xHCI driver issue a Reset Device command to
inform the Etron xHCI host that the USB device associated with a
device slot has been reset. Seems that the Etron xHCI host can not
perform this command correctly, affecting the USB device.

To work around this, the xHCI driver should obtain a new device slot
with reference to commit 651aaf36a7d7 ("usb: xhci: Handle USB transaction
error on address command"), which is another way to inform the Etron
xHCI host that the USB device has been reset.

Add a new XHCI_ETRON_HOST quirk flag to invoke the workaround in
xhci_discover_or_reset_device().

Fixes: 2a8f82c4ceaf ("USB: xhci: Notify the xHC when a device is reset.")
Cc: <stable@...r.kernel.org>
Signed-off-by: Kuangyi Chiang <ki.chiang65@...il.com>
---
 drivers/usb/host/xhci-pci.c |  1 +
 drivers/usb/host/xhci.c     | 19 +++++++++++++++++++
 drivers/usb/host/xhci.h     |  1 +
 3 files changed, 21 insertions(+)

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 33a6d99afc10..ddc9a82cceec 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -397,6 +397,7 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
 	if (pdev->vendor == PCI_VENDOR_ID_ETRON &&
 	    (pdev->device == PCI_DEVICE_ID_EJ168 ||
 	     pdev->device == PCI_DEVICE_ID_EJ188)) {
+		xhci->quirks |= XHCI_ETRON_HOST;
 		xhci->quirks |= XHCI_RESET_ON_RESUME;
 		xhci->quirks |= XHCI_BROKEN_STREAMS;
 	}
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 899c0effb5d3..ef7ead6393d4 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -3692,6 +3692,8 @@ void xhci_free_device_endpoint_resources(struct xhci_hcd *xhci,
 				xhci->num_active_eps);
 }
 
+static void xhci_free_dev(struct usb_hcd *hcd, struct usb_device *udev);
+
 /*
  * This submits a Reset Device Command, which will set the device state to 0,
  * set the device address to 0, and disable all the endpoints except the default
@@ -3762,6 +3764,23 @@ static int xhci_discover_or_reset_device(struct usb_hcd *hcd,
 						SLOT_STATE_DISABLED)
 		return 0;
 
+	if (xhci->quirks & XHCI_ETRON_HOST) {
+		/*
+		 * Obtaining a new device slot to inform the xHCI host that
+		 * the USB device has been reset.
+		 */
+		ret = xhci_disable_slot(xhci, udev->slot_id);
+		xhci_free_virt_device(xhci, udev->slot_id);
+		if (!ret) {
+			ret = xhci_alloc_dev(hcd, udev);
+			if (ret == 1)
+				ret = 0;
+			else
+				ret = -EINVAL;
+		}
+		return ret;
+	}
+
 	trace_xhci_discover_or_reset_device(slot_ctx);
 
 	xhci_dbg(xhci, "Resetting device with slot ID %u\n", slot_id);
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index f0fb696d5619..4f5b732e8944 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1624,6 +1624,7 @@ struct xhci_hcd {
 #define XHCI_ZHAOXIN_HOST	BIT_ULL(46)
 #define XHCI_WRITE_64_HI_LO	BIT_ULL(47)
 #define XHCI_CDNS_SCTX_QUIRK	BIT_ULL(48)
+#define XHCI_ETRON_HOST	BIT_ULL(49)
 
 	unsigned int		num_active_eps;
 	unsigned int		limit_active_eps;
-- 
2.25.1